title: Countertorque testing and histomorphometric analysis of various implant surfaces in canines: a pilot study.
abstract: As surface roughness may play a role in the mechanical attachment of an implant surface to bone, various implant surfaces have been prepared and analyzed by removal torque (countertorque) or push-out tests in a variety of animal model systems. Rougher surfaces generally have displayed higher mechanical testing values, indicating a stronger implant-bone interface. This pilot study was undertaken to test the countertorque values for integrated threaded implants with surfaces prepared by machining, blasting, and acid-etching, to compare the various implant surface types histomorphometrically for percentage of bone-implant contact under loaded and unloaded conditions, and to determine the degree of correlation between countertorque values and bone-implant contact with varying degrees of surface roughness. The results of this animal investigation suggest that the strength of the bone-implant interface, as determined by countertorque testing, is influenced by different surface characteristics. Acid-etched surfaces resisted countertorque forces more successfully as compared with blasted or machined surfaces. Histologic evaluation of bone contact with the various implant surfaces did not demonstrate a definite advantage for rougher surfaces in regard to percentage of bone contact at the light microscopic level.
authors.affiliation: University of Uruguay, Montevideo, Uruguay.
authors.forename: P
authors.initials: P
authors.lastname: Pebé
authors.forename: R
authors.initials: R
authors.lastname: Barbot
authors.forename: J
authors.initials: J
authors.lastname: Trinidad
authors.forename: A
authors.initials: A
authors.lastname: Pesquera
authors.forename: J
authors.initials: J
authors.lastname: Lucente
authors.forename: R
authors.initials: R
authors.lastname: Nishimura
authors.forename: H
authors.initials: H
authors.lastname: Nasr
mesh_terms: D000134:Acid Etching, Dental; D000704:Analysis of Variance; D000818:Animals; D003758:Dental Implantation, Endosseous / Q000379:methods / Q000706:statistics & numerical data; D003764:Dental Materials / Q000737:chemistry; D004285:Dogs; D005269:Femur / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D016348:Osseointegration; D010865:Pilot Projects; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry; D019415:Torque
chemical_list: D003764:Dental Materials; D014025:Titanium